I thought originally you were talking about books where the author had asked you to represent the telegram, thinking you were preparing the epub for them for wider distribution, but now I see you're talking about books only you are reading. Well can't you keep that embedded font and use your preferred Georgia for everything else, if you're doing it for yourself?
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Even so, with Georgia (which IS sans-serif)
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Georgia is a serif font, but you can mix fonts in a font-family, a whole list of serif fonts and then end on sans-serif.